Crazy Tach a spedometer

[Extremo]

Hi,

I have RRC 94 LWB with a great drama with the tach and speedometer, when drive and I put my foot in a break pedal both tech & speed goes down and when release again no problem it´s work fine, in the nigth when turn on light the problem is huge, when the air compresor of the ABS start both goes down, when put the letf o right signal both tach & speed start moving on the rythem of the signaling, and obviusly when used the break pedal goes down, please any body have some advice.

Best regards
from Chile

Chester

[OkieRover]

Alternator!
Tach issues are often related to the alternator on our models.
This makes even more sense because you describe many issues with electrical function and the drain they are having on the charging system.

Get your battery checked and make sure it's up to snuff.
Then you should probably look at the alternator.